Structure and efficient luminescence upconversion of Ln(iii) aromatic N-oxide coordination polymers

Area of Science:

• Materials Science
• Inorganic Chemistry
• Photochemistry

Background:

• Lanthanide-based coordination polymers are of interest for their unique optical properties.
• Upconversion luminescence in lanthanide materials enables the conversion of lower-energy photons to higher-energy ones.
• Developing new materials with tunable luminescence is crucial for advanced applications.

Purpose of the Study:

• To synthesize and characterize a series of lanthanide-based coordination polymers with varying ratios of Yb(iii) and Er(iii).
• To investigate the photoluminescence properties, including near-infrared and upconversion emission, of these novel materials.
• To explore the potential of these materials for visible and UV light emission.

Main Methods:

• Solvent diffusion techniques were used for the synthesis of coordination polymers.
• Elemental analyses and single-crystal X-ray diffraction (SXRD) were employed for structural characterization.
• Solid-state photoluminescence studies were conducted to analyze luminescence properties.

Main Results:

• An isomorphous series of 2D coordination polymers, {[Yb1-xErx(4,4'-bpdo)3(H2O)2](CF3SO3)3}∞, was successfully synthesized.
• The materials exhibited both near-infrared (NIR) luminescence and visible upconversion emission upon 980 nm excitation.
• Visible emission in red, green, and blue regions was observed, corresponding to Er(iii) transitions, along with unprecedented UV emission from Er(iii) in a Ln-MOF.

Conclusions:

• The synthesized lanthanide coordination polymers possess tunable luminescence properties.
• These materials demonstrate efficient upconversion luminescence, paving the way for applications in photonics and sensing.
• The observation of UV emission from Er(iii) in a Ln-MOF is a significant advancement in the field.